drop support for powerpc-freebsd-eabihf

FreeBSD 15 dropped this target. It also dropped x86-freebsd-none, but since that
target remains buildable and usable with the 32-bit compat layer, we keep it for
now.

lib/std/Target.zig

@@ -865,7 +865,6 @@ pub const Abi = enum {
             },
             .freebsd => switch (arch) {
                 .arm,
-                .powerpc,
                 => .eabihf,
                 else => .none,
             },

lib/std/zig/target.zig

@@ -71,7 +71,6 @@ pub const available_libcs = [_]ArchOsAbi{
     .{ .arch = .mips64el, .os = .linux, .abi = .gnuabin32, .os_ver = .{ .major = 2, .minor = 6, .patch = 0 }, .glibc_triple = "mips64el-linux-gnu-n32" },
     .{ .arch = .mips64el, .os = .linux, .abi = .muslabi64, .os_ver = .{ .major = 2, .minor = 3, .patch = 48 } },
     .{ .arch = .mips64el, .os = .linux, .abi = .muslabin32, .os_ver = .{ .major = 2, .minor = 6, .patch = 0 } },
-    .{ .arch = .powerpc, .os = .freebsd, .abi = .eabihf, .os_ver = .{ .major = 7, .minor = 1, .patch = 0 } },
     .{ .arch = .powerpc, .os = .linux, .abi = .gnueabi, .os_ver = .{ .major = 1, .minor = 3, .patch = 45 }, .glibc_triple = "powerpc-linux-gnu-soft" },
     .{ .arch = .powerpc, .os = .linux, .abi = .gnueabihf, .os_ver = .{ .major = 1, .minor = 3, .patch = 45 }, .glibc_triple = "powerpc-linux-gnu" },
     .{ .arch = .powerpc, .os = .linux, .abi = .musleabi, .os_ver = .{ .major = 1, .minor = 3, .patch = 45 } },

tools/process_headers.zig

@@ -81,7 +81,6 @@ const musl_targets = [_]LibCTarget{
 const freebsd_targets = [_]LibCTarget{
     .{ .arch = .arm, .abi = .eabihf },
     .{ .arch = .aarch64, .abi = .none },
-    .{ .arch = .powerpc, .abi = .eabihf },
     .{ .arch = .powerpc64, .abi = .none },
     .{ .arch = .riscv64, .abi = .none },
     .{ .arch = .x86, .abi = .none },